Tire-deflation indicator.



H. JAGOBY. TIRE DEPLATION INDIGATOB.. APPLICATION FILED 001'. za, 1911.

1,062,567. Patented may 20,1913.

HERMANN JACOBY, OF EBERSTADT, NEAR DARMSTADT, GERMANY.

TIRE-DEFLATION INDICATOR. v

Specification of Letters Patent.

' vPat-@nani May 2o, 1913.

\ Application led October 28, 1911. Seri-a1 No. 656,202.'

T o ,all whom t may concern matically indicating the decrease of pressure in pneumatic tires, andconsists substantially therein that a sprin pressed bolt, which strikes a ainst the roa 1s formed as a hammer for irectly actuating a bell secured to the rim of the wheel.

The invention is illustrated in the accom-v panying drawing, wherein a sectional view of a pneumatic tire is shown with the device of my invention attached thereto.

To the wooden rim a, carrying the steel felly .b with thel outer casing `for the inflatable tube' d, a support e is arranged, one end f of which is'bent and laterally engages the wooden rim a. The other end of this sup-4 port has two arms h, which are provided with guide openings for a boltz,` the cross section of which is olygonal. The upper end m ofthe bolt i 1s bent and adapted to strikel against the bell o which is secured to the rim a by means of the screw bolt, q. This bolt q serves both for securing the tire arrangement and passes through a suitable hole of the support e. A thumb nut r,

which is screwed on the bolt g, in combinastroke.

tion with the head plate s serves to hold the tire arrangement, the rim, the support and the bell together. Between the arms L a spring t encircling 'the boltz' is disposed, which can be freely rotated. When the spring is rotated a pin u passing through the bolt and engaging between the coils of the spring t, is displaced, so that the bent end of the bar z' can be adjusted opposite the bell o atany desired distance. On account of this arrangement the spring t serves at the same time to regulate the force of the The pin u divides the action of the spring into 'two parts, which work against each other in such a manner that the lower spring portion/v acts as a buiier spring for the upper portion w, as without being been damaged, it is preferable to select for .the tires bells of different tones.

In the position shown, the tire is inflate and the lower end of the bar z' held above the road surface and the hammer m is held out of engagement with the bell o. On delation of the tire, the wheel will descend toward the road surface thereby lowering the rod z. When, on rotation ofthe wheel, the rod i attains a lowermost position, it will engage the road surface and be elevated in its support e thereby tensioning the upper spring portion fw. On continued rotation of the wheel, the rod i will be `freed *from-its engagement'with the road surface,

thereby releasing the tension on the upper spring portion w so that the resulting recoil lthereof will cause the hammer m to strike the bell o. The pin u will thereby tension the lower spring portion d so that the recoil of the latter will raise the hammer m, immediately after its engagement with the bell o, thereby preventing the hammer from deadening the resonance of the bell.

The spring may be rotated to chan ge the number of convolutions of the spring, on either side of the pin u, thereby varying the differential action of the bumper portion d and the actuator portion fw, of said spring t.

It will be seen from the foregoing that the rod with its pin engaging the spring, substantially as shown, constitute spring controlled differentially acting bell striking and road engaging mechanism.

What I claim as new and desire to secure by Letters Patent is :-v

l. In combination with a pneumatic tire and a wheel structure, of a device for indicating deflation of the tire comprising a bell, an element movably mounted on the structure for striking the bell and engaging the road and having a spring engaging member, and a rotatably mounted spiral spring engaging said member to control said element and adapted to be rotated to alter its spring action on saidelement, substantially as described. l

2. In combination with a pneumatic-tire and a wheel'structure, of a device for indicating deation of the tire comprising a bell, an element movably mounted on the struc` ture for striking the bell 'and engaging the road, and a spiralspring, said element having means engaging the convoltions of the spring at a point nearer oneend of the I spring than the other, whereby, one portion bell` asingle rigid element having a bell striking portion and a road engaging portion, guiding means for said element carried. by said wheel structure and maintaining the road engaging portion in range of the road for retraction of the bell strikingportion away from said bell upon deflation of the tire, and an actuating spring for returning said element and engaging the striking por" tion with said bell, substantially as described.

4. In combination with a pneumatic tire and a wheel structure, of a. device carried by said structure for indicating deflation of the tire and comprising a bell, a road en gaging and bell striking device, and a spring mechanism comprising actuating and bumper portions for engagino'and freeing said device with and from the bell subsequent to actuation of said device upon deflation of the tire, substantially as described.

5. In combination with a pneumatic tire and a Wheel structure, of a device for indicating deflation of the tire comprising a bell, an element movably mounted on said structure for striking the bell and engaging the road, a spiral spring for cgntrolling said element, and means carried by said element and engaging the convolutions of said sp1-ing between the ends thereof whereby a differential spring action is imparted to said element upon deflation of2 the tire, substantially as described.

In testimony whereof I atiix my signature in presence of two witnesses. HERMANN J ACOBY. Witnesses:

'JEAN GRUND, CARL GRUND. 

